Publication Date:
2019-11-13
Description:
Introduction Kidney iron deposition has been described in hemolytic disorders including mechanical valves, paroxysmal nocturnal hematuria, and sickle cell disease (Roberts & Morrow, Circulation 1966; Leonardi & Ruol, Blood 1960). Circulating plasma hemoglobin is filtered at the glomerulus and reabsorbed via the megalin cubulin system in the proximal and distal tubules (Gburek et al, J Am Soc Nephrol 2002). On MRI, this manifests as signal loss on gradient and spin echo sequences in the cortex of the kidney with complete sparing of the medulla (Jeong et al, Radiographics 2002). The signal darkening is quantified by the parameter R2*, which has been shown to be directly proportional to tissue iron in the liver and heart. Kidney R2* has previously been demonstrated to rise proportionally to lactate dehydrogenase (LDH) in chronically transfused sickle cell disease (SCD) patients (Wood et al, Br J Haematol 2016; Schein et al, J Magn Reson Imaging 2008), but LDH is not a specific marker of hemolysis, and chronically transfused patients could potentially deposit iron in the kidney through other mechanisms. Therefore, we characterized the relationship between kidney R2*, urinary iron and markers of hemolysis in non-transfused SCD patients. Methods Sixty-five non-transfused SCD patients were recruited to the study, which was approved by the Institutional Review Board of Children's Hospital Los Angeles. Following medical history and physical exam, subjects completed blood and urine testing, and then abdominal MRI for assessment of somatic iron stores. R2* measurements were collected using multiple gradient echo pulse sequences on 1.5 Tesla magnets. Statistical analysis was performed using JMP® Pro, Version 14.0.0 (SAS Institute Inc., Cary, NC, 2018). Results Subjects were generally adults with a mean age of 32 years. Nearly three quarters of subjects had homozygous sickle cell disease, while a quarter had SC disease or S-Beta thalassemia, and one subject had sickle cell trait. Most subjects were anemic, and all subjects had elevated markers of hemolysis. Fifty-four percent of subjects had an elevated kidney R2* level (≥34 Hz). On univariate analysis, kidney R2* was associated with urinary iron (R2=0.52, p
Print ISSN:
0006-4971
Electronic ISSN:
1528-0020
Topics:
Biology
,
Medicine
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